/Engine/Source/Developer/DesktopPlatform/Public/IDesktopPlatform.h
Launches UnrealBuildTool with the specified command line parameters
process handle to the new UBT process
[FProcHandle](API\Runtime\Core\Unix\FProcHandle) InvokeUnrealBuildToolAsync ( const [FString](API\Runtime\Core\Containers\FString) & InCmdLineParams, [FOutputDevice](API\Runtime\Core\Misc\FOutputDevice) & Ar, void *& OutReadPipe, void *& OutWritePipe, bool bSkipBuildUBT )